"Route taxi's" for $1 around Ocho Rios area to get around (Dunn's River etc.)

i've only read a few things here and there but cant seem to find much info on it. but apparently there are routed taxi's or shuttles that go down the stretch of highway from st ann's bay to Port maria only for about $1. They are able to stop at the points of interests in the middle like mystic mountain, dolphin cove or dunn's river.

if anyone has taken these before, what do they look like, where do they typically pick up, any pictures? any tips or instructions in general.

is it perhaps "someone" doesnt want people to know these exists?

thanks,